CPU, GPU, PCH and Motherboard Testing: Pinpoint Diagnosis, Cold-Test Impedance & Power Sequence (Images + PDF Download Free)

Motherboard repair has become more advanced — modern CPUs and GPUs rely on complex VRM designs, multi-stage power sequencing and ultra-low-impedance rails. Whether you repair laptops, desktop motherboards, GPUs, or custom PCBs, three techniques remain essential:

✅ Pinpoint testing
✅ Cold-test impedance measurement
✅ Power sequence tracing

This guide explains each method in practical, technician-friendly language. At the end, you can request a free download with power sequence charts, rail diagrams, and testing images.

📋 SPECIFICATIONS
Device Type	💻 Laptop \| 🖥️ Desktop \| Graphic card
Brand/Model	All
MB Part No	all
CPU/MCU/GPU	🔵 INTEL \| 🔴 AMD \| 🔵 nVIDIA
File Size	395MB

👇 Click the link below to download CPU, GPU,PCH and MB Charts repair guide for free:

📂 CPU Charts Guide Files

Pinpoint Diagnosis, Cold-Test Impedance & Power Sequence Charts

Instant Download

📂GPU Charts Guide Files

Pinpoint Diagnosis, Cold-Test Impedance & Power Sequence Charts

Instant Download

📂PCH Charts Guide Files

Pinpoint Diagnosis, Cold-Test Impedance & Power Sequence Charts

Instant Download

📂Motherboard Charts Guide Files

Pinpoint Diagnosis, Cold-Test Impedance & Power Sequence Charts

Instant Download

🔑 RAR File Password: indiafix

🧭 1. What Is Pinpoint Testing?

Pinpoint testing means checking individual rails, gates, MOSFET stages, and signals one by one instead of random guessing. Instead of replacing parts blindly, you use signals to identify exactly where the fault stops.

Common pinpoint checks include:

VIN → DC-in → charger IC → MOSFET switching
3V/5V ALW standby generation
EC (embedded controller) activity
CPU/GPU core activation

Pinpointing eliminates guesswork and speeds up board repair.

❄️ 2. Cold Test / Impedance Measurement

Cold testing means measuring resistance/impedance with the board powered OFF. This is critical for detecting:

If any rail reads 0Ω or near 0, there is a direct short.

⚡ 3. Understanding Power Sequence

Every motherboard powers up in a strict order. If one rail fails, everything stops.

Typical laptop/desktop power sequence:

VIN / Adapter detect → 3.3V / 5V Standby → EC firmware loads → Power button event → SLP_S5 de-assert → S0 rails ON → CPU/GPU VRM enable → Clock and reset signals → BIOS executes → Display / POST

Critical signals for diagnosis:

ACOK / ACDET, ALL_SYS_PWRGD, PM_SLP_S5/S4/S3#, PLTRST#, PWROK, VR_READY

For GPUs (NVIDIA/AMD cards):

Check 12V PCIe rails,Memory rails (1.35V / 1.5V / 1.8V),Vcore impedance,Shorted high-side MOSFETs,VRAM short detection through resistance mode,Missing CLKREQ# → no display

If any of these signals fail → system will not start.

📜 Legal Notice

The provided this repair files (CPU, GPU, PCH and Motherboard Testing: Pinpoint Diagnosis) are shared strictly for educational and repair purposes only. Big thanks to @Elektronik_sc for files

💬 If the CPU, GPU, PCH and Motherboard Testing: Pinpoint Diagnosis Repair Guide download link doesn't work or you need a different revision, leave a comment and we'll update the file ASAP!